Greenkeeper 212 Timer Runs But No Water—Master Valve or Supply Issue

Greenkeeper 212 runs through both zone times but no water flows. Timer appears functional.

Checklist

1. Main water supply: Is isolation valve fully open?
2. Master valve: Check controller back for wire on MV/Pump Start terminal. If present, master valve may be failed.
3. Valve solenoids: Measure 22-24VAC at solenoid when zone active
4. Controller output: Verify 22-24VAC at controller terminals

Diagnostic Path

• No voltage at controller → controller failed
• Voltage at controller, not at solenoid → wire cut
• Voltage at solenoid, no water → valve mechanical failure
• Master valve wire present but no master valve → programming error

Start at water source and work backward.